Science

Pumice is formed from acidic varieties of lava.

The diameter of Enceladus is 499 km.

Anorexia is a Greek term meaning denial of appetite, or loss of appetite.

Since the beginning of the 21st century, many companies and research laboratories have been working on developing commercial applications of graphene.

Already in the 19th century, scientists speculated that graphite was composed of layers.

Phobos craters are named after astronomers who contributed to the study of the moon, and characters and locations from Jonathan Swift's “Gulliver’s Travels.”

The Aurora Borealis in the northern hemisphere is visible between September 21 and March 21, between 6 p.m. and 1 a.m. when it is dark outside.

Until 1920, most astronomers believed that the Milky Way contained all the stars in the universe.

The first NASA crewed Space Program was Project Mercury.

Up to 14.000 square kilometers of the Moon's surface may remain in perpetual shadow.